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User quota is a completely different way to apply restrictions to control how users can create files and directories. By using quota, the amount of space that a user can occupy is limited. Configuring user quota is a simple five-step procedure: 1. Install the quota software. 2. Prepare the file system in which you want to use quota. 3. Initialize the quota system. 4. Apply quota to users and groups. 5. Start the quota service. Before starting to apply quota, you should first realize how it must be applied. Quotas are always user- or group-related and apply to a complete volume or partition. That is, if you have one disk in your server with one partition on it that holds your complete root file system, and you apply a quota of 100 MB for user zeina, this user can create no more than 100 MB of files anywhere on the file system. When working with quotas, you need to apply a hard limit, a soft limit, and a grace period. The soft limit is a limit that cannot be surpassed on a permanent basis. (The user can create more data than the quota allows on a temporary basis.) The grace period is the length of time that the user can temporarily exceed the soft limit. The hard limit is an absolute limit; after it s reached (or when the grace period elapses, whichever is sooner), the user can t create new files. Working with soft and hard limits is confusing at first glance, but it has some advantages: if a user has more data than the soft limit allows, she still can create new files and isn t stopped in her work immediately. She will, however, get a warning to create some space before the hard limit is reached.

If you ve switched to Ubuntu from Windows, there s a very good chance that the security failings of Windows featured in your decision. By any measure, Microsoft s record on security within its products is appalling. A new and serious security warning appears seemingly on an ongoing basis, and a new and devastating virus makes news headlines with similar frequency (usually described as a PC virus rather than what it actually is: a Windows virus). One argument is that Windows is the target of so many viruses merely because it s so popular. Although it s true that some of the underground crackers who write viruses dislike Microsoft, there s also little doubt that Windows has more than its fair share of security issues.

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To work with quotas, it makes sense that the quota software must be installed. You ll do this with the apt-get install quota command, and you ll notice soon enough whether you need to run it. If you try to use one of the quota management utilities (such as edquota) when the quota software has not been installed yet, you ll see a message that it has to be installed first.

The situation is certainly getting better but, even so, Microsoft s latest operating system, Windows XP, provides many good examples of why it s an easy target. Upon installation, the default user is given root powers. True, a handful of tasks can be performed only by the genuine administrator, but the default user can configure hardware, remove system software, and even wipe every file from the hard disk, if he pleases. Of course, you would never intentionally damage your own system, but computer attackers use various techniques to get you to run malicious software (by pretending it s a different file, for example) or by simply infecting your computer across the Internet without your knowledge, which is how most worms work. Viruses and worms also usually take advantage of security holes within Windows software. As just one example, a famous security hole within Outlook Express allowed a program attached to an e-mail message to run when the user simply clicked a particular message to view it. In other words, infecting a Windows machine was as easy as sending someone an e-mail message! It s a different story with Linux. Viruses and worms are far rarer than they are on Windows. In fact, the total number of viruses and worms that have been found in the wild infecting Linux systems number far less than 100 (one report published in 2003 put the number at 40, and the number is unlikely to have grown much since then). Compare that to Windows, where according to the Sophos antivirus labs (www.sophos.com), approximately 1,000 new viruses are discovered every month! The Sophos antivirus product now guards against just under 100,000 viruses.

After inserting the row, return to the dbo.Shippers table in Object Explorer, right-click, and open the table again. You ll see that the new row has been added, as shown in Figure 5-14.

Before you can use the quota software to limit the amount of disk space that a user can use on a given file system, you must add an option to /etc/fstab for all file systems that must support quota. Here s the procedure: 1. Open /etc/fstab with an editor. 2. Select the column with options. Add the option usrquota if you want to apply quota to users and grpquota for groups. Repeat this procedure for all file systems in which you want to use quota.

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